US20050190107A1 - Wireless device having antenna - Google Patents
Wireless device having antenna Download PDFInfo
- Publication number
- US20050190107A1 US20050190107A1 US11/023,494 US2349404A US2005190107A1 US 20050190107 A1 US20050190107 A1 US 20050190107A1 US 2349404 A US2349404 A US 2349404A US 2005190107 A1 US2005190107 A1 US 2005190107A1
- Authority
- US
- United States
- Prior art keywords
- antenna element
- wireless device
- coupled
- feeding point
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 10
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Transceivers (AREA)
Abstract
A wireless device includes a first antenna element resonating with a first frequency, a first feeding point coupled to the first antenna element and disposed on a ground plane in the wireless device, a first matching circuit of which first end is coupled to the first feeding point, a second antenna element resonating a second frequency higher than the first frequency, a second feeding point coupled to the second antenna element and disposed on the ground plane, a second matching circuit of which one end is coupled to the second feeding point, and a radio circuit coupled via a transmission line to a common connection point shared by respective second ends of the first and second matching circuits.
Description
- The present invention relates to a wireless device having an antenna, and more particularly it relates to a wireless device such as a cellular phone to be used in a mobile communication.
- Recently the mobile communication including cellular phones provides versatile services in data communication such as communications in audio, text and dynamic picture. This market trend requires a more sophisticated wireless device, in particular, a wireless device having a more sophisticated antenna is demanded. Because the antenna is a gate for receiving and transmitting an electromagnetic wave, and its performance is one of large factors affecting the performance of the wireless device.
- A conventional wireless device is described hereinafter with reference to
FIG. 3 which illustrates schematically the conventional wireless device having an antenna. InFIG. 3 ,antenna 103 is placed side by side withground plane 108.Antenna 103 includesantenna element 101 for resonating with a first frequency andantenna element 102 for resonating with a second frequency.Antenna 103 is coupled tofeeding point 104 disposed onground plane 108, and coupled toradio circuit 107 viamatching circuit 105 andtransmission circuit 106. The structure discussed above formswireless device 109. - As discussed above, the construction of conventional
wireless device 109 allows asingle feeding point 104 to feed both offirst antenna element 101 andsecond antenna element 102 with electricity.First antenna element 101 resonates with the frequency ranging from 880 MHz-960 MHz, namely, GSM (Global System of Mobile Communication) band, andsecond antenna element 102 resonates with the frequency ranging from 1710 MHz-1880 MHz, namely, DCS (Digital Communication System) band. - When the wireless device discussed above receives a frequency of GSM band,
first antenna element 101 energizes an electric current using an electromagnetic wave received, and the current runs toradio circuit 107 viafeeding point 104,matching circuit 105 andtransmission line 106. As a result, the electromagnetic wave is received by the wireless device. - When a frequency of GSM band is transmitted from the wireless device, a signal generated in
radio circuit 107 is conveyed tofirst antenna element 101 viatransmission line 106,matching circuit 105 andfeeding point 104.First antenna element 101 energizes the signal into an electromagnetic wave, which is then radiated, thereby carrying out a transmission. - When the wireless device receives/transmits a frequency of DCS band,
second antenna element 102 receives/transmits an electromagnetic wave in the same manner as the case of receiving/transmitting an electromagnetic wave of GSM band. - As such conventional
wireless device 109 deals with the two kinds of frequencies, i.e. GSM and DCS. Japanese patent application non-examined publication No. 2003-101335 discloses one of the prior art related to what is discussed above. - However, since the construction of the conventional wireless device allows one
single feeding point 104 to feed both ofantenna elements elements - Further, matching
circuit 105 adjusts two different electromagnetic waves independently by itself in order to obtain two different and desirable resonant frequencies, so that when a first resonance frequency is adjusted, a second one changes synchronously. As a result, it is difficult to adjust only the first resonance frequency efficiently and independently of the second one. - The present invention aims to overcome the problems discussed above, and provides a wireless device that can reduce a coupling loss of two antenna elements and adjust a frequency independently of other frequencies to a desirable resonance frequency although the wireless device handles numbers of frequencies. The wireless device of the present invention comprises the following elements:
- (a) a first antenna element for resonating with a first frequency;
- (b) a first feeding point coupled to the first antenna element and disposed on a ground plane in the wireless device;
- (c) a first matching circuit of which first end is coupled to the first feeding point;
- (d) a second antenna element for resonating with a frequency higher than the first frequency;
- (e) a second feeding point coupled to the second antenna element and disposed on the ground plane in the wireless device;
- (f) a second matching circuit of which first end is coupled to the second feeding point; and
- (g) a radio circuit coupled to a common contact shared by a second end of the first matching circuit and a second end of the second matching circuit via a transmission line.
- The construction discussed above has two feeding points corresponding to the first antenna element and the second antenna element respectively and independently, so that a coupling loss between the two antenna elements can be reduced. On top of that, the construction has two matching circuits corresponding to the two antenna elements respectively and independently, namely, the first matching circuit and the second one. It is easy to adjust two different resonant frequencies independently.
-
FIG. 1 shows schematically a wireless device in accordance with an exemplary embodiment of the present invention. -
FIG. 2 shows a perspective view illustrating a wireless device, having an antenna made from antenna elements made of spring metal and insulating resin, in accordance with an exemplary embodiment of the present invention. -
FIG. 3 shows schematically a conventional wireless device having an antenna. - An exemplary embodiment of the present invention is demonstrated hereinafter with reference to the accompanying drawings.
FIG. 1 shows schematically a wireless device in accordance with the exemplary embodiment of the present invention.FIG. 2 shows a perspective view illustrating a wireless device, having an antenna comprising antenna elements made of spring metal and insulating resin, in accordance with the exemplary embodiment of the present invention. -
Wireless device 19 of the present invention comprises the following elements: - (a)
first antenna element 11 for resonating with a first frequency; - (b)
first feeding point 14 coupled tofirst antenna element 11 and disposed onground plane 8 inwireless device 19; - (c) first matching
circuit 16 of which first end is coupled tofirst feeding point 14; - (d)
second antenna element 12 for resonating with a frequency higher than the first frequency; - (e)
second feeding point 15 coupled tosecond antenna element 12 and disposed onground plane 8; - (f) second matching
circuit 17 of which first end is coupled tosecond feeding point 15; and - (g)
radio circuit 7 coupled tocommon contact 18 shared by a second end offirst matching circuit 16 and a second end ofsecond matching circuit 17 viatransmission line 6. - The foregoing construction of
wireless device 19 of the present invention is detailed hereinafter. InFIG. 1 ,antenna 13 is placed side by side withground plane 8, and includesfirst antenna element 11 resonating with a first frequency andsecond antenna element 12 resonating with a second frequency. -
First antenna element 11 is coupled tofirst feeding point 14 placed onground plane 8, andfirst feeding point 14 is coupled to a first end offirst matching circuit 16. On the other hand,second antenna element 12 is coupled tosecond feeding point 15 placed onground plane 8, andsecond feeding point 15 is coupled to a first end ofsecond matching circuit 17. A second end offirst matching circuit 16 and a second end ofsecond matching circuit 17 are coupled to each other atcommon connection point 18, which is coupled toradio circuit 7 viatransmission line 6. -
First antenna element 11 resonates with the first frequency, i.e. GSM band of 880 MHz-960 MHz, andsecond antenna element 12 resonates the second frequency higher than the first one, i.e. DCS band of 17710 MHz-1880 MHz. - First matching
circuit 16 is formed ofinductor 20 coupled betweenfirst feeding point 14 andcommon connection point 18. Second matchingcircuit 17 is formed ofcapacitor 22 andinductor 21.Capacitor 22 is coupled betweensecond feeding point 15 andcommon connection point 18, andinductor 21 is coupled betweensecond feeding point 15 andground plane 8. -
Wireless device 19 having the structure discussed above can receive or transmit the frequency of GSM band becausefirst antenna element 11 resonates with the GSM frequency. It can also receive or transmit the frequency of DCS band becausesecond antenna element 12 resonates with the DCS frequency. - According to the exemplary embodiment,
wireless device 19 has two feeding points corresponding tofirst antenna element 11 andsecond antenna element 12 respectively and independently, so that a coupling loss between the twoantenna elements wireless device 19 has two matchingcircuits antenna elements - The foregoing structure of matching
circuits wireless device 19 handles the first frequency,second antenna element 12 is electrically isolated fromtransmission line 6 bycapacitor 22 ofsecond matching circuit 17. Further,second antenna element 12 is electrically coupled toground plane 8 byinductor 21 ofsecond matching circuit 17, so thatsecond antenna element 12 works as a parasitic antenna element. As a result, the compound resonance betweenfirst antenna element 11 andsecond antenna element 12 working as a parasitic antenna element can widen a band of the first frequency. -
Inductor 20 offirst matching circuit 16 works at the first frequency such that the resonance frequency offirst antenna element 11 can be lowered, thereby downsizingfirst antenna element 11.Inductor 20 also works as a high impedance to the second frequency, so that it advantageously shuts off the electrical transmission of the second frequency tofirst antenna element 11. This mechanism allows adjusting the two frequencies independently more easily. - The placement of the passive components such as capacitors and inductors of matching
circuits FIG. 1 , but the passive components can be placed arbitrarily so that the impedance can be adjusted. In this case, the foregoing idea is desirably adopted. -
First antenna element 11 shown inFIG. 1 is formed of a meander antenna; however,antenna element 11 is not limited to this construction, e.g.first antenna element 23 is formed of a folded monopole antenna as shown inFIG. 2 . It can be also any type of linear-, helical-, meander-, and planar-antenna or it can be constructed by combining those antenna types.Second antenna element 12 can be also any type of antenna as discussed above. A part offirst antenna element 11 or a part ofsecond antenna element 12 is grounded toground plane 8, so that the antenna element can work as an inverted F antenna. This construction allows adjusting the impedance more flexibly. -
FIG. 2 shows a perspective view illustrating a wireless device, comprising an antenna formed of antenna elements made of spring metal and insulating resin, in accordance with the exemplary embodiment of the present invention. In this embodiment shown inFIG. 2 ,first antenna element 23 andsecond antenna element 24 are formed together with insulatingresin 25, thereby formingantenna 26. According to this construction, insulatingresin 25 suppresses deformation offirst antenna element 23 andsecond antenna element 24, andantenna 26 can be downsized with ease thanks to the dielectric constant of insulatingresin 25. - On top of that,
first antenna element 23 andsecond antenna element 24 are made of spring metal such as phosphor bronze. An end of each antenna element is coupled tofirst feeding point 27 andsecond feeding point 28 respectively by applying pressure. This construction allowsantenna 26 to be coupled to respective feeding points 27 and 28 with ease free from soldering. - In
wireless device 31 in accordance with this exemplary embodiment, a first end offirst matching circuit 29 and a first end ofsecond matching circuit 30 are coupled tofirst feeding point 27 andsecond feeding point 28 respectively. Second ends of each ofcircuits common connection point 18, which is coupled toradio circuit 7 viatransmission line 6. Those structures remain unchanged from that shown inFIG. 1 . The foregoing construction allowswireless device 31 to adjust respective resonant frequencies corresponding tofirst antenna element 23 andsecond antenna element 24 independently with ease. - As discussed above, the wireless device of the present invention has two feeding points corresponding to two antenna elements respectively and independently, so that a coupling loss between the two antenna elements can be reduced. On top of that, the wireless device has two matching circuits corresponding to the two antenna elements respectively and independently, so that two independent resonant frequencies different from each other can be adjusted with ease. It is thus concluded that the present invention advantageously provides the foregoing wireless device having an antenna.
Claims (5)
1. A wireless device comprising:
(a) a first antenna element for resonating with a first frequency;
(b) a first feeding point coupled to the first antenna element and disposed on a ground plane in the wireless device;
(c) a first matching circuit of which first end is coupled to the first feeding point;
(d) a second antenna element for resonating with a frequency higher than the first frequency;
(e) a second feeding point coupled to the second antenna element and disposed on the ground plane in the wireless device;
(f) a second matching circuit of which first end is coupled to the second feeding point; and
(g) a radio circuit coupled via a transmission line to a common contact shared by a second end of the first matching circuit and a second end of the second matching circuit.
2. The wireless device of claim 1 , wherein the second matching circuit is formed of a capacitor coupled between the second feeding point and the common connection point, and an inductor coupled between the second feeding point and the ground plane.
3. The wireless device of claim 1 , wherein the first antenna element and the second antenna element are formed together with insulating resin.
4. The wireless device of claim 1 , wherein shapes of the first antenna element and the second antenna element are one of linear, helical, meander, and planar, or the shapes thereof are formed by combining any of linear, helical, meander, and planar.
5. The wireless device of claim 1 , wherein the first antenna element and the second antenna element are made of spring metal;
wherein an end of the first antenna element is coupled to the first feeding point by applying pressure; and
wherein an end of the second antenna element is coupled to the second feeding point by applying pressure.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-51083 | 2004-02-26 | ||
JP2004051083A JP4301034B2 (en) | 2004-02-26 | 2004-02-26 | Wireless device with antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050190107A1 true US20050190107A1 (en) | 2005-09-01 |
US7084831B2 US7084831B2 (en) | 2006-08-01 |
Family
ID=34747494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/023,494 Expired - Fee Related US7084831B2 (en) | 2004-02-26 | 2004-12-29 | Wireless device having antenna |
Country Status (5)
Country | Link |
---|---|
US (1) | US7084831B2 (en) |
EP (1) | EP1569300B1 (en) |
JP (1) | JP4301034B2 (en) |
CN (1) | CN1661855A (en) |
DE (1) | DE602005014824D1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
JP4301034B2 (en) | 2009-07-22 |
EP1569300B1 (en) | 2009-06-10 |
CN1661855A (en) | 2005-08-31 |
US7084831B2 (en) | 2006-08-01 |
EP1569300A1 (en) | 2005-08-31 |
DE602005014824D1 (en) | 2009-07-23 |
JP2005244553A (en) | 2005-09-08 |
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